***** Description *****
This replication archive contains all data and code to replicate the main tables
and figures in "A measure of survey mode differences" by Jonathan Homola, Natalie
Jackson, and Jeff Gill.



***** File Overview *****
** R scripts **
HomolaJacksonGill_EntropyModeDifferences.R -- R script to generate Tables 1-5 and
Figures 3-4.

HomolaJacksonGill_EntropyModeDifferences_Figures.R -- R script to generate Figures
1 and 5.


** Data files **
HomolaJacksonGill_EntropyModeDifferences_Data.csv -- The main dataset is a subset
of the American National Election Studies 2012 Time Series Study (ANES 2012). In
addition, it also contains some additional variables we coded up to determine the
scale length of a given question. This dataset is used to create Tables 1-5 and
Figures 3-4.

HomolaJacksonGill_EntropyModeDifferences_Brexit.csv -- An additional dataset with
polling information regarding the "Brexit" vote. This dataset is used to create
Figure 1.



***** Additional Information *****
The following R packages were used to produce the results:
1) xtable version 1.8-2
2) ecodist version 1.2.9



***** References *****
American National Election Studies, 2012. The ANES 2012 Time Series Study [dataset].
The University of Michigan and Stanford University, Ann Arbor, MI and Palo Alto, CA.

Homola, Jonathan, Natalie Jackson, and Jeff Gill. 2016. "A measure of survey mode 
differences." Electoral Studies 44: 255-274.
http://dx.doi.org/10.1016/j.electstud.2016.06.010